<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>canvas</title>
  </head>
  <body>
    <canvas></canvas>
  </body>
  <script>
    const canvas = document.querySelector("canvas");
    const context = canvas.getContext("2d");

    context.fillRect(100, 100, 200, 200);
  </script>
</html>
